CONTENTS. 



TRANSACTIONS OF THE SOCIETY. 



PAGE 



I, — CONTEIBUTIONS TO THE StUDY OP THE OOGENESIS OF 



Patella. By Reginald James Ludford, B.Sc. (Lond.), 

 Zoology Department, University College, London. (Two 

 Plates) 1 



II.— The Reduction of Osmic Acid by Lipoids. By J. R. 



Partington and D. B. Huntingford 15 



III.— A New Method of Treating and Mounting Celloidin 



Sections. By E. J. Sheppard, F.R.M.S 20 



lY.— The Behaviour of the Nucleolus during Oogenesis, 

 WITH Special Reference to the Mollusc Patella. 

 By Reginald James Ludford, B.Sc. (Lond.), F.R.M.S., 

 Department of Zoology, University College, London. 

 (Two Plates) .. .": 121 



Y.— Some Suggestions Regarding the Mechanical Design 

 of Microscopes. By Captain Frank Oppenheimer, 

 LM.S., M.B., Ch.B., F.R.M.S 134 



YL— Mr. Fred Enock's Method of Mounting Heads of 



Insects without Pressure. By the Rev. J. S. Pratt 141 



YIL— Polarizers for the Microscope. By B. K. Johnson, 

 Department of Optical Engineering, Imperial College of 

 Science and Technology 147 



YIII. — A POLARISCOPE for DISSECTING AND PoCKET MICRO- 

 SCOPES. By Prof. G. H. Bryan, F.R.S 149 



IX. — Some Abbe Letters. Read by Professor Cheshire, C.B.E., 



F.R.M.S. (Four Text-Figures) 221 



X. — The Technique of Culturing Amceba proteus. By 

 Monica Taylor, S.N.D., D.Sc, and Catherine Hayes, 

 S.N.D. Communicated by Professor J. Bronte Gatenby, 

 F.R.M.S 241 



XL — On the Presence of Two Spermathec.^ in the Rare 

 Mole Flea (Hystrichopsylla talp^), and the 

 Flea as Distributor of a Tyroglyphid. By F. 

 Martin Duncan, F.R.M.S., F.R.P.S., F.Z.S. (One Plate 

 and Three Text- Figures) 245 



